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Finding the Fourth Proportional to 611.96, 915.89 and 561.38

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Solution

The fourth proportional to 611.96, 915.89 and 561.38 is: 840.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.96 : 915.89 = 561.38 : x
  2. Step 2: Convert to fraction form
    611.96/915.89 = 561.38/x
  3. Step 3: Cross multiply
    611.96x = 915.89 × 561.38
  4. Step 4: Simplify right side
    611.96x = 514,161.81
  5. Step 5: Solve for x
    x = 514,161.81/611.96
  6. Step 6: Final answer
    x = 840.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.